straw ashes
Ashes produced by burning straw, traditionally used for various purposes such as fertilizer or in crafts.
In the past, straw ashes were used as fertilizer for rice paddies.
Standard kanji spelling.
Mixed kana-kanji spelling, also used.
Compound of 藁 (wara, 'straw') and 灰 (hai, 'ashes'). The reading わらばい is a regular rendaku form.